Eitgen blasberg



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E'IBLAS-BERG. :[-LIDDERI No. 503,120.Y f Patented Aug. 15, 1893. l

1 Edi/1'; a:

UNITED STATES PATENT OFFICE.

EUGEN BLASBERG, OF DUSSELDORF, GERMANY.

LADDER.

SPECIFICATION forming part of Letters Patent No. 503,120, dated August 15, 1893.

Application filed March 6, 1893. Serial No. 464,695. (Normodel.)

To all whom it may concern:

Be it known that I, EUGEN BLASBERG, a subject of the German Emperor, residing at Dusseldorf, Germany, have invented certain.

which, when swung down, project below the run gs of the upper ladder to support the same. In the accompanying drawings: Figure 1 is a vertical section of my improved ladder; Fig. 2 a front view thereof; Fig. 3 a side elevation of the catch showing it lowered; Fig.v

4 a cross section on line Fig. 3; Fig. 5 a front view of Fig. 3; Fig.' 6 a side elevation of the catch showing it partly raised; Fig. 7 a similar elevation showing it completely raised and Fig. 8 a cross section on line y, y, Fig. 7.

The letters a, represent the side bars of the lower ladder.

b are the side bars of the upper ladder and c, c, a pair of encircling straps that permit the upper ladder to be'lowered or raised.

To the inner face of the side bars a, there is pivoted a stop or lever 7c, which when in a horizontal' position, extends beneath the rungs, steps or projections b of the upper ladder. To the side bars ct, there are secured above and preferably also below the lever lo, the stops s, s', which are arranged diagonally opposite each other as shown. These stops maintain the lever in a horizontal position against pressure applied to the upper edge of its free end. Thus it will be seen, that when the lever is swung down (Fig. 3) to project beneath one of the rungs b', of the upper ladder, it will securely lock such ladder in position. The upper ladder can be raised freely as the rungs when passing the lever will tilt the same. I prefer to Weight the lever at its free end, so that it will automatically assume its horizontal position when no longer tilted by the rungs and'will thus lock the npperladder in place.

When the upper ladder is to be lowered, it is first slightly raised,to liberate lever k, and then such lever is swung up (Figs. 6 and 7) to clear the rungs. In its upright position, the lever lo, can be held, either by being swung beyond its center, or it can be engaged by a spring catch ol, pivotally secured to side bar d.

What I claim isl. The combination of a lower ladder with an upper sliding ladder, an embracing strap, a lever secured to the lower ladder and proj ecting beneath the rungs of the upper ladder and with a stop that engages the upper edge of the lever, substantially as specified.

2. The combination of a lower ladder and an upper ladder, with the lever k, pivoted to the side bar of the lower ladder and adapted to be projected beneath the rungs of the upper ladder and with diagonally arranged stops s, s', on opposite sides of the lever and a catch d, substantially as specified.

In testimony whereof I have signed this specification in the presence of two subscrib-7o ing witnesses.

EUGEN BLASBERG.

Witnesses:

SOEEN LIsToE., W. OTTO. 

